CN110441981A - A kind of colored structures optical projection device - Google Patents
A kind of colored structures optical projection device Download PDFInfo
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- CN110441981A CN110441981A CN201910681049.0A CN201910681049A CN110441981A CN 110441981 A CN110441981 A CN 110441981A CN 201910681049 A CN201910681049 A CN 201910681049A CN 110441981 A CN110441981 A CN 110441981A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a kind of colored structures optical projection devices, belong to field of projection display, comprising: the first monochromatic source forms uniform Illumination Distribution after the first even even light of mating plate on the first grating；Second monochromatic source forms uniform Illumination Distribution after the second even even light of mating plate on the second grating；Third monochromatic source forms uniform Illumination Distribution after the even light of the even mating plate of third on third grating；First grating, the second grating and third grating are located at three sides of light-combining prism, it is mechanical transmission grating, each grating is equidistant with light-combining prism corresponding side surface, and projection lens will be on the picture of the first grating, the second grating and third grating simultaneously projection to three-dimension object to be measured.The mechanical transmission grating relative position that the present invention uses is adjustable, stroboscopic effect is completely eliminated, each monochromatic source can be used different colors and combine to form different color structured lights simultaneously, and therefore, the application demand of colored structures optical projection device disclosed by the invention is wider.
Description
Technical field
The invention belongs to field of projection display, more particularly, to a kind of colored structures optical projection device.
Background technique
It is well known that color image is capable of providing more information relative to monochrome greyscale image.In non-contact 3-D
It in profile measurement field, is projected using the color structured light Jing Guo phase demodulating to three-dimensional object surface, frame coloured silk can be passed through
Chromatic graph picture isolates the image of several grayscale informations, realizes the rapid survey to three-dimensional object profile.Currently, realizing colored structures
The main means of light projection are using digital projection technique, including DLP (Digital Light Procession) projection, LCOS
(Liquid Crystal on Silicon) projection and LCD (Liquid Crystal Display) projection etc., common throwing
Shadow equipment is exactly commercial style projector.Since digital projector volume is larger, it is not particularly suited for mobile, handheld three-dimensional measurement
Equipment, such as hand held oral scanner.
In addition, (not including at present adopting using the 3-D measuring apparatus that the realization color structured light of digital projection technique projects
With 3DMD-Digital Micromirror Device technology, 3LCD and 3LCOS technology), it needs to carry out spatially colour
Intensity modulated, formed one group have modulated signal sequential color.There is the time between the sequence that this projection pattern generates
Difference, i.e. stroboscopic effect not only limit three-dimensional measurement speed, while being also not particularly suited for the three-dimensional measurement to dynamic object.
Even if using the projector of 3DMD technology, 3LCD technology and 3LCOS technology, can eliminate between time difference,
But mobile, handheld three-dimensional measuring device can not be extremely suitable for along with the increase of projection light machine volume.Secondly, number
Word formula colored structures light projecting device, hardware cost is higher, is unfavorable for the extensive use of industrial circle.
Based on drawbacks described above and deficiency, this field needs to make further improvement to existing colored structures optical projection device
Design reduces the volume of projection arrangement, reduces power consumption and hardware cost, eliminates stroboscopic effect.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of colored structures optical projection devices, it is intended to solve
Stroboscopic effect problem existing for certainly existing colored structures optical projection device.
To achieve the above object, the present invention provides a kind of colored structures optical projection devices, comprising: the first monochromatic source,
Second monochromatic source, third monochromatic source, the first even mating plate, the second even mating plate, the even mating plate of third, the first grating, the second grating,
Third grating, light-combining prism and projection lens；
The first grating, the first even mating plate and the first monochromatic source are sequentially placed in front of light-combining prism；Before light-combining prism
Side, the first grating and the first even mating plate are parallel to each other；The outgoing light direction of first monochromatic source is vertical with the first even mating plate；
The right of light-combining prism is sequentially placed the second grating, the second even mating plate and the second monochromatic source；The right side of light-combining prism
Side, the second grating and the second even mating plate are parallel to each other；The outgoing light direction of second monochromatic source is vertical with the second even mating plate；
The rear of light-combining prism is sequentially placed the even mating plate of third grating, third and third monochromatic source；After light-combining prism
Side, third grating and the even mating plate of third are parallel to each other；The outgoing light direction of third monochromatic source is vertical with the even mating plate of third；
The leading flank of light-combining prism at a distance from the first grating, the right side of light-combining prism at a distance from the second grating and
The trailing flank of light-combining prism three at a distance from third grating is equal；
Projection lens is placed in the left of light-combining prism, parallel with the left side of light-combining prism；
The color of first monochromatic source, the second monochromatic source and third monochromatic source is different；
First grating, the second grating and third grating are mechanical transmission grating；
First even mating plate is distributed the first monochromatic source in the uniform-illumination of the first grating, and the second even mating plate makes the second monochrome
Light source is distributed in the uniform-illumination of the second grating；The even mating plate of third makes third monochromatic source in the uniform-illumination point of third grating
Cloth；First grating, the second grating and third grating are used to generate structure light；Light-combining prism is used for the first grating, the second light
The structure light that grid and third grating generate merges；Projection lens is used for the structured light projection that will merge to three-dimension object to be measured.
Preferably, the first grating moves horizontally or static in the front parallel direction of light-combining prism；Second grating is in light combination
The right parallel direction of prism moves horizontally or static；Third grating moves horizontally or quiet in the rear parallel direction of light-combining prism
Only.
Preferably, the first grating, the second grating and the equal projected fringe structure light of third grating or projection gridiron pattern structure
Light；
Preferably, the width for the light transmission part that the first grating includes is equal or unequal；The transmittance section that second grating includes
The width divided is equal or unequal；The width for the light transmission part that third grating includes is equal or unequal；
Preferably, projection lens is telecentric lens；
Preferably, mechanical transmission grating is metal transmission-type grating；
Preferably, the first monochromatic source, the second monochromatic source and third monochromatic source are laser light source or LED light source.
Preferably, the first monochromatic source is red light source, and the second monochromatic source is green light source, and third monochromatic source is indigo plant
Color light source；
Or first monochromatic source be red light source, the second monochromatic source be blue-light source, third monochromatic source be green light
Source；
Or first monochromatic source be green light source, the second monochromatic source be red light source, third monochromatic source be blue light
Source；
Or first monochromatic source be green light source, the second monochromatic source be blue-light source, third monochromatic source be red light
Source；
Or first monochromatic source be blue-light source, the second monochromatic source be green light source, third monochromatic source be red light
Source；
Or first monochromatic source be blue-light source, the second monochromatic source be red light source, third monochromatic source be green light
Source.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
1, the first grating of the invention, the second grating and third grating are all made of mechanical transmission grating, pass for replacing
The digital modulation formula grating of system, while mechanical transmission grating relative position is adjustable.It is different from traditional electric-controlled type spatial light
Modulator, mechanical shutters change to the regulating and controlling passage not at any time of light field, and stroboscopic effect is completely eliminated.
2, the position of the first grating, the second grating and third grating is adjustable in the present invention, while the first monochromatic light
Source, the second monochromatic source and third monochromatic source can be combined using different colors, be formed after light-combining prism different
Color structured light, therefore, the application demand of colored structures optical projection device disclosed by the invention are wider.
3, the present invention can make combined structure light clear at each position on three-dimensional object under test using telecentric lens
It focuses, is not in empty Jiao Xianxiang, projected picture is sharper keen, promotes the promotion of measurement accuracy.
4, since electric-controlled type spatial light modulator being not used in apparatus of the present invention, corresponding control circuit and soft is not needed yet
Part, whole hardware configuration will it is simpler, stability is stronger, cost is lower, volume is smaller.
Detailed description of the invention
Fig. 1 is the structure chart of colored structures optical projection device provided by the invention；
Fig. 2 is bar shaped transmission-type grating structure chart provided by the invention；
Fig. 3 is gridiron pattern transmission-type grating structure chart provided by the invention；
Description of symbols:
The first monochromatic source of 1-；The even mating plate of 2- first；The first grating of 3-；The second grating of 4-；The even mating plate of 5- second；6- second
Monochromatic source；7- third grating；The even mating plate of 8- third；9- third monochromatic source；10- light-combining prism；11- projection lens；12- is waited for
Survey three-dimension object；The light transmission part of 13- bar shaped transmission-type grating；The light-blocking part of 14- bar shaped transmission-type grating；15- gridiron pattern
The light transmission part of transmission-type grating；16, the light-blocking part of 17- gridiron pattern transmission-type grating.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the present invention provides a kind of colored structures optical projection devices, comprising: the first monochromatic source 1, second
Monochromatic source 6, third monochromatic source 9, the first even mating plate 2, the second even mating plate 5, the even mating plate 8 of third, the first grating 3, the second light
Grid 4, third grating 7, light-combining prism 10 and projection lens 11；
The front of light-combining prism 10 is sequentially placed the first grating 3, the first even mating plate 2 and the first monochromatic source 1；Light-combining prism
10 leading flank, the first grating 3 and the first even mating plate 2 are parallel to each other；The outgoing light direction of first monochromatic source 1 and the first even light
Piece 2 is vertical；
The right of light-combining prism 10 is sequentially placed the second grating 4, the second even mating plate 5 and the second monochromatic source 6；Light-combining prism
10 right side, the second grating 4 and the second even mating plate 5 are parallel to each other；The outgoing light direction of second monochromatic source 6 and the second even light
Piece 5 is vertical；
The rear of light-combining prism 10 is sequentially placed the even mating plate 8 of third grating 7, third and third monochromatic source 9；Light-combining prism
10 trailing flank, third grating 7 and the even mating plate 8 of third is parallel to each other；The outgoing light direction and the even light of third of third monochromatic source 9
Piece 8 is vertical；
The leading flank of light-combining prism 10 at a distance from the first grating 3, the right side of light-combining prism 10 and the second grating 4 away from
From and light-combining prism 10 trailing flank at a distance from third grating 7 three it is equal；
Projection lens 11 is placed in the left of light-combining prism 10, parallel with the left side of light-combining prism 10；
The color of first monochromatic source 1, the second monochromatic source 6 and third monochromatic source 9 is different；First grating 3,
Two gratings 4 and third grating 7 are mechanical transmission grating；
First even mating plate 2 is distributed the first monochromatic source 1 in the uniform-illumination of the first grating 3, and the second even mating plate makes second
Monochromatic source 6 is distributed in the uniform-illumination of the second grating 4；The even mating plate of third makes third monochromatic source 9 in the illumination of third grating 7
It is uniformly distributed；First grating 3, the second grating 4 and third grating 7 are used to generate structure light；Light-combining prism 10 is used for first
The structure light that grating 3, the second grating 4 and third grating 7 generate merges；The structured light projection that projection lens 12 is used to merge is extremely
On three-dimension object 12 to be measured.
First grating, the second grating and third grating of the invention is all made of mechanical transmission grating, for replacing tradition
Digital modulation formula grating, mechanical transmission grating relative position is adjustable, and stroboscopic effect is completely eliminated.
Preferably, the first grating moves horizontally or static in the front parallel direction of light-combining prism；Second grating is in light combination
The right parallel direction of prism moves horizontally or static；Third grating moves horizontally or quiet in the rear parallel direction of light-combining prism
Only.
The relative position of each grating is other than it will keep equal with the vertical range of corresponding light-combining prism, in each grating institute
Horizontal direction in direction can be adjusted arbitrarily, and vertical direction is vertical range direction of each grating to corresponding light-combining prism side,
The relative position adjustability of each grating is, it can be achieved that different types of colour projection, including when being not limited to colored width, color alignment
Sequentially；
The difference of colored width refers to that the width for the light transmission part that the first grating includes is equal or unequal；Second grating packet
The width of the light transmission part contained is equal or unequal；The width for the light transmission part that third grating includes is equal or unequal；First
The width of light transmission part between grating, the second grating and third grating can independence and freedom adjust, it is unrestricted each other；
First grating, the second grating and the equal projected fringe structure light of third grating project gridiron pattern structure light；
Fig. 2 is that the first grating, the second grating and third grating are bar shaped transmission-type grating structure chart, the grating of the structure
Structure corresponds to projected fringe structure light, and dash area 13 indicates light transmission part in figure, and 14 be light-blocking part, the width of each light transmission part
There is no limit there is no limit the width of light transmission part and the width of light-blocking part are each other for the width of each light-blocking part for degree
It is not restricted；
Fig. 3 is that the first grating, the second grating and third grating are gridiron pattern transmission-type grating structure chart, the light of the structure
The corresponding projection gridiron pattern structure light of grid structure；Dash area described in 15 in figure is light transmission part, and 16,17 be light-blocking part；Respectively
There is no limit there is no limit the width of the width of light transmission part and light-blocking part for the width of each light-blocking part for the width of light transmission part
Degree is not also restricted each other；
Projection lens is telecentric lens；Combined structure light can be made each on three-dimensional object under test using telecentric lens
It is clearly focused at position, is not in empty Jiao Xianxiang, projected picture is sharper keen, promotes the promotion of measurement accuracy.
Preferably, the first monochromatic source, the second monochromatic source and third monochromatic source are laser light source or LED light source.
Preferably, according to the difference of the light-combining prism plating form membrane used, the first monochromatic source 1,6 and of the second monochromatic source
The possible combining form of third monochromatic source are as follows:
First monochromatic source is red light source, and the second monochromatic source is green light source, and third monochromatic source is blue-light source；
Or first monochromatic source be red light source, the second monochromatic source be blue-light source, third monochromatic source be green light
Source；
Or first monochromatic source be green light source, the second monochromatic source be red light source, third monochromatic source be blue light
Source；
Or first monochromatic source be green light source, the second monochromatic source be blue-light source, third monochromatic source be red light
Source；
Or first monochromatic source be blue-light source, the second monochromatic source be green light source, third monochromatic source be red light
Source；
Or first monochromatic source be blue-light source, the second monochromatic source be red light source, third monochromatic source be green light
Source.
Since the position of the first grating, the second grating and third grating in the present invention is adjustable, while first is monochromatic
Light source, the second monochromatic source and third monochromatic source can be combined using different colors, be formed after light-combining prism different
Color structured light, therefore, the application demand of colored structures optical projection device disclosed by the invention is wider.
Using the first monochromatic source as feux rouges, the second monochromatic source is green light, for third monochromatic source is blue light, illustrates this
The course of work of the colored structures optical projection device provided is provided:
Feux rouges forms uniform Illumination Distribution on the first grating 3 after the first even light of even mating plate 2；Green light is even through second
After the even light of mating plate 5, uniform Illumination Distribution is formed on the second grating 4；Blue light is after the even light of the even mating plate 8 of third, in third light
Uniform Illumination Distribution is formed on grid 7；The relative position of first grating 3, the second grating 4 and third grating 7 and light-combining prism is such as
Shown in Fig. 1, each grating is equidistant with light-combining prism corresponding side surface, and projection lens 11 is by the first grating 3,4 and of the second grating
The picture of third grating 7 is simultaneously on projection to three-dimension object to be measured.
Colored structures optical projection device provided by the invention, in conjunction with the principle of projection display equipment, to key component such as light
Grid, color-combination prism, light source and even mating plate structure and its installation site studied and designed, projection can be completely eliminated
The stroboscopic problem of device, and the volume of projection arrangement is greatly reduced, while the colored structures optical projection device structure is simple
And it is compact, stability is good, low in energy consumption, at low cost, have a good application prospect.Colored structures optical projection device in the present invention
It is particularly suitable in mobile, handheld scanning device, the application scenarios scanned such as oral cavity.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of colored structures optical projection device characterized by comprising the first monochromatic source, the second monochromatic source, third list
Color light source, the first even mating plate, the second even mating plate, the even mating plate of third, the first grating, the second grating, third grating, light-combining prism and
Projection lens；
The front of light-combining prism is successively placed in parallel the first grating and the first even mating plate, and the outgoing light direction of the first monochromatic source hangs down
Directly in the front of the first even mating plate；The right of light-combining prism is successively placed in parallel the second grating and the second even mating plate, and second is monochromatic
Right of the outgoing light direction of light source perpendicular to the second even mating plate；The rear of light-combining prism is successively placed in parallel third grating and
Three even mating plates, third monochromatic source are emitted light direction perpendicular to the rear of the even mating plate of third；The leading flank of light-combining prism and
The distance of one grating, light-combining prism right side at a distance from the second grating and the trailing flank of light-combining prism and third grating
It is equal apart from three；
The left of light-combining prism is placed in parallel projection lens；First monochromatic source, the second monochromatic source and third monochromatic source
Color is different；First grating, the second grating and third grating are mechanical transmission grating；
First even mating plate is distributed the first monochromatic source in the uniform-illumination of the first grating, and the second even mating plate makes the second monochromatic source
It is distributed in the uniform-illumination of the second grating；The even mating plate of third is distributed third monochromatic source in the uniform-illumination of third grating；The
One grating, the second grating and third grating are used to generate structure light；Light-combining prism is used for the first grating, the second grating and the
The structure light that three gratings generate merges；Projection lens is used for the structured light projection that will merge to three-dimension object to be measured.
2. colored structures optical projection device according to claim 1, which is characterized in that first grating is in light-combining prism
Front parallel direction move horizontally or static；Second grating moves horizontally or quiet in the right parallel direction with light prism
Only；The third grating moves horizontally or static in the rear parallel direction of light-combining prism.
3. colored structures optical projection device according to claim 1 or 2, which is characterized in that first grating, the second light
Grid and the equal projected fringe structure light of third grating project gridiron pattern structure light.
4. colored structures optical projection device according to claim 3, which is characterized in that the projection lens is telecentric mirror
Head.
5. colored structures optical projection device according to claim 1, which is characterized in that the mechanical transmission grating is gold
Belong to transmission-type grating.
6. any colored structures optical projection device according to claim 1~5, which is characterized in that first monochromatic light
Source, the second monochromatic source and third monochromatic source are laser light source or LED light source.
7. colored structures optical projection device according to claim 6, which is characterized in that first monochromatic source is red
Light source, second monochromatic source are green light source, and the third monochromatic source is blue-light source；
Or first monochromatic source is red light source, second monochromatic source is blue-light source, the third monochromatic source
For green light source；
Or first monochromatic source is green light source, second monochromatic source is red light source, the third monochromatic source
For blue-light source；
Or first monochromatic source is green light source, second monochromatic source is blue-light source, the third monochromatic source
For red light source；
Or first monochromatic source is blue-light source, second monochromatic source is green light source, the third monochromatic source
For red light source；
Or first monochromatic source is blue-light source, second monochromatic source is red light source, the third monochromatic source
For green light source.
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Application publication date: 20191112 |